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                <h3 id="一、前言"><a href="#一、前言" class="headerlink" title="一、前言"></a>一、前言</h3><p>洛谷每个月都会举办月赛，这次我参加的是 $Div.2$（实力不允许）。</p>
<p>以下只讲我会做的题目。</p>
<h3 id="二、A：「MCOI-05」饱食"><a href="#二、A：「MCOI-05」饱食" class="headerlink" title="二、A：「MCOI-05」饱食"></a>二、A：「MCOI-05」饱食</h3><p>传送门：<a target="_blank" rel="noopener" href="https://www.luogu.com.cn/problem/P7566?contestId=30514">https://www.luogu.com.cn/problem/P7566?contestId=30514</a></p>
<p>对于这道题，我估计大家一定会先想到 $DFS$ 死算。其实这完全没有必要，可以统计每只兔子的名字的首字母的出现次数，然后关注“M”“C”“O”“I”四个字母的出现次数。</p>
<p>$AC$ 代码：</p>
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span><span class="token string">&lt;cstdio></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span><span class="token string">&lt;cstring></span></span>
<span class="token keyword">using</span> <span class="token keyword">namespace</span> std<span class="token punctuation">;</span>
<span class="token keyword">int</span> n<span class="token punctuation">;</span>
<span class="token keyword">long</span> <span class="token keyword">long</span> rabbit_capital<span class="token punctuation">[</span><span class="token number">26</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">&#123;</span>
	<span class="token function">scanf</span><span class="token punctuation">(</span><span class="token string">"%d"</span><span class="token punctuation">,</span><span class="token operator">&amp;</span>n<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;=</span>n<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
	<span class="token punctuation">&#123;</span>
		<span class="token keyword">char</span> temp<span class="token punctuation">[</span><span class="token number">12</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
		<span class="token function">scanf</span><span class="token punctuation">(</span><span class="token string">"%s"</span><span class="token punctuation">,</span><span class="token operator">&amp;</span>temp<span class="token punctuation">)</span><span class="token punctuation">;</span>
		rabbit_capital<span class="token punctuation">[</span>temp<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">++</span><span class="token punctuation">;</span>
	<span class="token punctuation">&#125;</span>
	<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"%lld\n"</span><span class="token punctuation">,</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'M'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">*</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'C'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">*</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'O'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">+</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'I'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">*</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'C'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">*</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'O'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">+</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'M'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">*</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'C'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">*</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'I'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">+</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'M'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">*</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'I'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token operator">*</span>rabbit_capital<span class="token punctuation">[</span><span class="token string">'O'</span><span class="token operator">-</span><span class="token string">'A'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>记录：<a target="_blank" rel="noopener" href="https://www.luogu.com.cn/record/50155330">https://www.luogu.com.cn/record/50155330</a>。</p>
<p>注意开 <code>long long</code>！正如一句话所言，十年 OI 一场空，不开 <code>long long</code> 见祖宗。</p>
<h3 id="三、B：「MCOI-05」魔仙"><a href="#三、B：「MCOI-05」魔仙" class="headerlink" title="三、B：「MCOI-05」魔仙"></a>三、B：「MCOI-05」魔仙</h3><p>传送门：<a target="_blank" rel="noopener" href="https://www.luogu.com.cn/problem/P7567?contestId=30514">https://www.luogu.com.cn/problem/P7567?contestId=30514</a></p>
<p>这道题其实是有规律的。</p>
<p>首先，若这个数不能被4整除，必无解。</p>
<p>若这个数能被4整除，必有解。至于规律，见代码。</p>
<p>$AC$ 代码：</p>
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span><span class="token string">&lt;cstdio></span></span>
<span class="token keyword">using</span> <span class="token keyword">namespace</span> std<span class="token punctuation">;</span>
<span class="token keyword">int</span> n<span class="token punctuation">,</span>t<span class="token punctuation">;</span>
<span class="token keyword">int</span> magic<span class="token punctuation">[</span><span class="token number">1000005</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">&#123;</span>
	<span class="token comment">//cin>>t;</span>
	<span class="token function">scanf</span><span class="token punctuation">(</span><span class="token string">"%d"</span><span class="token punctuation">,</span><span class="token operator">&amp;</span>t<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> time<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>time<span class="token operator">&lt;</span>t<span class="token punctuation">;</span>time<span class="token operator">++</span><span class="token punctuation">)</span>
	<span class="token punctuation">&#123;</span>
		<span class="token comment">//cin>>n;</span>
		<span class="token function">scanf</span><span class="token punctuation">(</span><span class="token string">"%d"</span><span class="token punctuation">,</span><span class="token operator">&amp;</span>n<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">if</span><span class="token punctuation">(</span>n<span class="token operator">%</span><span class="token number">4</span><span class="token operator">!=</span><span class="token number">0</span><span class="token punctuation">)</span>
		<span class="token punctuation">&#123;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"w33zAKIOI\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">continue</span><span class="token punctuation">;</span>
		<span class="token punctuation">&#125;</span>
		<span class="token keyword">else</span> <span class="token keyword">if</span><span class="token punctuation">(</span>n<span class="token operator">%</span><span class="token number">8</span><span class="token operator">==</span><span class="token number">0</span><span class="token punctuation">)</span>
		<span class="token punctuation">&#123;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"2 %d"</span><span class="token punctuation">,</span>n<span class="token operator">/</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">int</span> prt_cnt<span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;=</span><span class="token number">2</span><span class="token operator">+</span>n<span class="token operator">/</span><span class="token number">2</span><span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">" -1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				prt_cnt<span class="token operator">++</span><span class="token punctuation">;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;=</span>n<span class="token operator">-</span>prt_cnt<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">" %d"</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token punctuation">(</span>i<span class="token operator">%</span><span class="token number">2</span><span class="token operator">==</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token operator">?</span><span class="token operator">-</span><span class="token number">1</span><span class="token operator">:</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">&#125;</span>
		<span class="token keyword">else</span>
		<span class="token punctuation">&#123;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"-2 %d"</span><span class="token punctuation">,</span>n<span class="token operator">/</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">int</span> prt_cnt<span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;=</span>n<span class="token operator">/</span><span class="token number">2</span><span class="token operator">-</span><span class="token number">2</span><span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">" -1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				prt_cnt<span class="token operator">++</span><span class="token punctuation">;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;=</span>n<span class="token operator">-</span>prt_cnt<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">" %d"</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token punctuation">(</span>i<span class="token operator">%</span><span class="token number">2</span><span class="token operator">==</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token operator">?</span><span class="token operator">-</span><span class="token number">1</span><span class="token operator">:</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">&#125;</span>
	<span class="token punctuation">&#125;</span>
	<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>记录：<a target="_blank" rel="noopener" href="https://www.luogu.com.cn/record/50155828">https://www.luogu.com.cn/record/50155828</a>。</p>
<h3 id="四、总分"><a href="#四、总分" class="headerlink" title="四、总分"></a>四、总分</h3><p>这场比赛我共获得 $215$ 分（$D$ 题骗了 $15$ 分），第 $110$ 名。</p>
<p><img src="https://z3.ax1x.com/2021/07/02/Rcd4sO.png" alt=""></p>
<h3 id="五、花絮"><a href="#五、花絮" class="headerlink" title="五、花絮"></a>五、花絮</h3><p>前面说过，我在 $D$ 题骗了 $15$ 分，而我手欠也报了 $Div.1$，惊讶地发现 $Div.2$ 的后两题就是 $Div.1$ 的前两题。</p>
<p>于是，我把 $Div.2$ 的 $D$ 题骗分代码照搬到 $Div.1$ 的 $B$ 题，也成功地拿到了 $15$ 分。</p>
<p><img src="https://z3.ax1x.com/2021/07/02/RcwFWq.png" alt=""></p>
<p>$Div.2$ 的 $D$ 题的骗分代码：</p>
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span><span class="token string">&lt;cstdio></span></span>
<span class="token keyword">using</span> <span class="token keyword">namespace</span> std<span class="token punctuation">;</span>
<span class="token keyword">int</span> n<span class="token punctuation">,</span>m<span class="token punctuation">,</span>k<span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">&#123;</span>
	<span class="token function">scanf</span><span class="token punctuation">(</span><span class="token string">"%d%d%d"</span><span class="token punctuation">,</span><span class="token operator">&amp;</span>n<span class="token punctuation">,</span><span class="token operator">&amp;</span>m<span class="token punctuation">,</span><span class="token operator">&amp;</span>k<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">if</span><span class="token punctuation">(</span>n<span class="token operator">==</span><span class="token number">1</span><span class="token operator">&amp;&amp;</span>m<span class="token operator">==</span><span class="token number">1</span><span class="token punctuation">)</span>
	<span class="token punctuation">&#123;</span>
		<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"YES\n\n1 1\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
	<span class="token punctuation">&#125;</span>
	<span class="token keyword">else</span> <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token punctuation">(</span>n<span class="token operator">==</span><span class="token number">3</span><span class="token operator">&amp;&amp;</span>m<span class="token operator">==</span><span class="token number">3</span><span class="token operator">&amp;&amp;</span>k<span class="token operator">==</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token operator">||</span>k<span class="token operator">==</span><span class="token number">1</span><span class="token punctuation">)</span>
	<span class="token punctuation">&#123;</span>
		<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"NO\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
	<span class="token punctuation">&#125;</span>
	<span class="token keyword">else</span> <span class="token keyword">if</span><span class="token punctuation">(</span>n<span class="token operator">==</span><span class="token number">6</span><span class="token operator">&amp;&amp;</span>m<span class="token operator">==</span><span class="token number">4</span><span class="token operator">&amp;&amp;</span>k<span class="token operator">==</span><span class="token number">4</span><span class="token punctuation">)</span>
	<span class="token punctuation">&#123;</span>
		<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"YES\nRRRDLLLDRRRDLLLDRRRDLLL\n1 1\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
	<span class="token punctuation">&#125;</span>
	<span class="token keyword">else</span> <span class="token keyword">if</span><span class="token punctuation">(</span>k<span class="token operator">==</span><span class="token number">0</span><span class="token punctuation">)</span>
	<span class="token punctuation">&#123;</span>
		<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"NO\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
	<span class="token punctuation">&#125;</span>
	<span class="token keyword">if</span><span class="token punctuation">(</span>k<span class="token operator">></span>m<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span>
	<span class="token punctuation">&#123;</span>
		<span class="token keyword">if</span><span class="token punctuation">(</span>m<span class="token operator">-</span><span class="token number">1</span><span class="token operator">==</span><span class="token number">0</span><span class="token operator">&amp;&amp;</span>k<span class="token operator">&lt;=</span>n<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span>
		<span class="token punctuation">&#123;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"NO\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
		<span class="token punctuation">&#125;</span>
		<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"YES\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">if</span><span class="token punctuation">(</span>n<span class="token operator">%</span><span class="token number">2</span><span class="token operator">==</span><span class="token number">0</span><span class="token punctuation">)</span>
		<span class="token punctuation">&#123;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;=</span>n<span class="token operator">/</span><span class="token number">2</span><span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>m<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"R"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"D"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>m<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"L"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
				<span class="token keyword">if</span><span class="token punctuation">(</span>i<span class="token operator">!=</span>n<span class="token operator">/</span><span class="token number">2</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"D"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"\n1 1\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">&#125;</span>
		<span class="token keyword">else</span>
		<span class="token punctuation">&#123;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;=</span>n<span class="token operator">/</span><span class="token number">2</span><span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>m<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"R"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"D"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>m<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"L"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"D"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>m<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"R"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"\n1 1\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">&#125;</span>
		<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
	<span class="token punctuation">&#125;</span>
	<span class="token keyword">else</span> <span class="token keyword">if</span><span class="token punctuation">(</span>k<span class="token operator">></span>n<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span>
	<span class="token punctuation">&#123;</span>
		<span class="token keyword">if</span><span class="token punctuation">(</span>n<span class="token operator">-</span><span class="token number">1</span><span class="token operator">==</span><span class="token number">0</span><span class="token operator">&amp;&amp;</span>k<span class="token operator">&lt;=</span>m<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span>
		<span class="token punctuation">&#123;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"NO\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
		<span class="token punctuation">&#125;</span>
		<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"YES\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">if</span><span class="token punctuation">(</span>m<span class="token operator">%</span><span class="token number">2</span><span class="token operator">==</span><span class="token number">0</span><span class="token punctuation">)</span>
		<span class="token punctuation">&#123;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;=</span>m<span class="token operator">/</span><span class="token number">2</span><span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>n<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"D"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"R"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>n<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"U"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
				<span class="token keyword">if</span><span class="token punctuation">(</span>i<span class="token operator">!=</span>m<span class="token operator">/</span><span class="token number">2</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"R"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"\n1 1\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">&#125;</span>
		<span class="token keyword">else</span>
		<span class="token punctuation">&#123;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">;</span>i<span class="token operator">&lt;=</span>m<span class="token operator">/</span><span class="token number">2</span><span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>n<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"D"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"R"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>n<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
				<span class="token punctuation">&#123;</span>
					<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"U"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">&#125;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"R"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> j<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>j<span class="token operator">&lt;</span>n<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
			<span class="token punctuation">&#123;</span>
				<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"D"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">&#125;</span>
			<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"\n1 1\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">&#125;</span>
		<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
	<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p><del>要不是题目开了 <code>Subtask</code>，我还能骗更多分。</del></p>
<h3 id="六、后记"><a href="#六、后记" class="headerlink" title="六、后记"></a>六、后记</h3><p>这次 $05$ 月月赛起码比上次 $04$ 月月赛的 $100/400$ 分好多了。</p>
<p><img src="https://z3.ax1x.com/2021/07/02/RcwZOU.png" alt=""></p>

                
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                                index_title = data_title.indexOf(keyword);
                                index_content = data_content.indexOf(keyword);
                                if (index_title < 0 && index_content < 0) {
                                    isMatch = false;
                                } else {
                                    if (index_content < 0) {
                                        index_content = 0;
                                    }
                                    if (i === 0) {
                                        first_occur = index_content;
                                    }
                                }
                            });
                        }
                        // show search results
                        if (isMatch) {
                            str += "<li><a href='" + data_url + "' class='search-result-title'>" + data_title + "</a>";
                            var content = data.content.trim().replace(/<[^>]+>/g, "");
                            if (first_occur >= 0) {
                                // cut out 100 characters
                                var start = first_occur - 20;
                                var end = first_occur + 80;
                                if (start < 0) {
                                    start = 0;
                                }
                                if (start === 0) {
                                    end = 100;
                                }
                                if (end > content.length) {
                                    end = content.length;
                                }
                                var match_content = content.substr(start, end);
                                // highlight all keywords
                                keywords.forEach(function (keyword) {
                                    var regS = new RegExp(keyword, "gi");
                                    match_content = match_content.replace(regS, "<em class=\"search-keyword\">" + keyword + "</em>");
                                });

                                str += "<p class=\"search-result\">" + match_content + "...</p>"
                            }
                            str += "</li>";
                        }
                    });
                    str += "</ul>";
                    $resultContent.innerHTML = str;
                });
            }
        });
    };

    searchFunc('/search.xml', 'searchInput', 'searchResult');
});
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